Now our social progress in science and technology, everyone has everyone on the use of high-tech, but for the assembly of a high-tech products and not many people know that, for a project to power supply is very important, for it can help better electric machine, the machine can operate together, to help us better to complete our work, so now everyone to power supply to have a good understanding, can help me solve some small problems in daily life, let me go to better understand them more, this to us is very important, I hope you are in constant progress, to find their own good what.